Problems 2.4.2, 2.4.3 and 3.3.2

Problems 3.3.6, 4.1.1 and 4.1.6

Problems 4.4.3, 5.5.1 and 5.5.3

**Chapter 2**

Problem 2.4.2 Commutators and traces

Problem 2.4.8 Commutators and a degenerate eigenvalue

**Chapter 3**

**Chapter 4**

Problem 4.4.1 Dispersion and eigenvectors

Problem 4.4.3 The Feynman-Hellmann theorem

Problem 4.4.6 The solar neutrino puzzle

Problem 4.4.7 The SchrÃ¶dinger and Heisenberg pictures

**Chapter 5**

Problem 5.5.1 An orthonormal basis of eigenvectors

**Chapter 6**

**Chapter 7**

Problem 7.4.2 Spectrum of a Hermitian operator

Problem 7.4.3 Canonical commutation relations

**Chapter 8**

Problem 8.5.1 Rotations

Problem 8.5.5 The Thomas-Reiche-Kuhn sum rule

Problem 8.5.6 The center of mass and the reduced mass*

**Chapter 9**

Problem 9.7.10 The probability current in three dimensions

Problem 9.7.11 The level density

**Chapter 10**

Problem 10.7.1 Properties of J

Problem 10.7.7 Independence of the energy from m

Problem 10.7.8 The spherical well